Automated airborne particulate matter collection, imaging, identification, and analysis

ABSTRACT

The following is an apparatus and a method that enables the automated collection and identification of airborne particulate matter comprising dust, pollen grains, mold spores, bacterial cells, and soot from a gaseous medium comprising the ambient air. Once ambient air is inducted into the apparatus, aerosol particulates are acquired and imaged under a novel lighting environment that is used to highlight diagnostic features of the acquired airborne particulate matter. Identity determinations of acquired airborne particulate matter are made based on captured images. Abundance quantifications can be made using identity classifications. Raw and summary information are communicated across a data network for review or further analysis by a user. Other than routine maintenance or subsequent analyses, the basic operations of the apparatus may use, but do not require the active participation of a human operator.

This application claims the benefit under 35 U.S.C. Section 119(e) ofthe following co-pending and commonly-assigned U.S. provisional patentapplication(s), which is/are incorporated by reference herein:

Provisional Application Ser. No. 62/076,507. Filed on Nov. 7, 2014entitled “Continuous Automated Air Sampling Device That CommunicatesAcquired Images to a Data Network”.

TECHNICAL FIELD

The technical field to which the subject matter of this disclosurerelates is Environmental Technology.

BACKGROUND ART

(Note: This application references a number of different non-patentpublications as indicated throughout the specification by one or morereference numbers within braces, e.g., {x}. A list of these differentpublications ordered according to these reference numbers can be foundbelow in the section titled “References”. Each of these publications isincorporated by reference herein.)

The concentrations of aerosol particulate matter in the ambient air is atop concern to humankind because airborne particulates have beenstrongly tied to human health consequences by numerous epidemiologicalstudies. Airborne particulates aggravate respiratory illness which isthe single largest cause of hospital admissions among children in theUnited States {1} and is responsible for a cost upwards of $56 billionin terms of health care expenses, lost productivity, and decreasedquality of life in the United States {2}, Short-term exposures (hours toseveral days) to elevated airborne particulate matter have been observedto exacerbate allergies and asthma {3-5}. Longer term exposures (yearsto decades) to elevated airborne particulate matter have substantiallygreater health risks such as increasing the probability of heartdisease, diabetes, and other chronic disease {6, 7}. Given that theallergenic virulence of some airborne particulates has increased overthe past three decades {8}, the prevalence of allergies and asthma inthe developed world has greatly increased over the same period {4-6, 9},and that the expression of asthma and allergies is forecasted tocontinue to intensify {10-12}, it is important to develop effectivemitigation strategies that will temper both the economic and healthburdens caused by airborne particulate-triggered respiratory illness.Knowing the types of particulates, their concentrations, and theirdistribution within a local environment helps in diagnosis, avoidance,and effective treatment.

Additionally, airborne particulate matter is of horticultural,ecological, and biological interest as it has applications in thepropagation and health of plants as well as the expansion of scientificknowledge.

Air-quality sampling devices exist, but the ability of such devices todiscern characteristics of airborne particulate matter beyond size rangeand reflectivity is limited. Such devices are useful for determining thequantity of certain sizes of airborne particulate matter, but givelittle insight into the shape, color, or other physical or biologicalproperties of the airborne particulate matter, and thus are notpractical for discerning detail or identifying airborne particulatematter.

Given the differing effects various components of airborne particulatematter on human health and plant well-being, it is important to be ableto quickly and reliably characterize the constitution of airborneparticulate matter. What is needed is a system and method that automatesthe collection of the air sample and captures diagnostic images whichcan then he used to characterize the identity of airborne particulatematter.

The disclosure described herein collects, minces, releases, analyzes,and identifies airborne particulate matter suspended in a gaseousmedium. The subject matter of the disclosure can function with orwithout human intervention, can discriminate between different types ofairborne particulate matter, and is more efficient and consistent thancurrent methods due to the implementation of a novel collectionapparatus and analysis method.

BRIEF DESCRIPTION OF DRAWINGS

(Note: This disclosure references components within each figuredescribed below. The naming convention used throughout the specificationis first to list the figure number, followed by a decimal point,followed by the specific component number of the given figure, prefacedby the word “Figure” or “Figures”, as the situation demands, and allincluded within parentheses, e.g., (x). For example, a reference to theillustration of the induction unit would be made as follows: (FIG.1.2).)

The features and advantages of the disclosure will become clearer withthe following detailed description in connection with the accompanyingdrawings, wherein:

FIG. 1 is a front-view illustration depicting an embodiment of a portionof the disclosure, with the following components identified:

-   -   1: ambient air    -   2: induction unit    -   3: airborne particulate inlet aperture    -   4: weather-resistant enclosure de-emphasized and indicated by a        dashed line    -   5: air chamber    -   6: electrode (may be the anode)    -   7: an embodiment of airborne particulate matter    -   8: deposition surface (or medium of deposition)    -   9: translation or rotation mechanism    -   10: spacer tube—part of the perception unit    -   11: high-resolution magnified digital camera—part of the        perception unit    -   12: pixel light ring—part of the perception unit    -   13: objective lens—part of the perception unit    -   14: linear focus apparatus—part of the perception unit    -   15: main controller board and on-board computer with integrated        Wi-fi communication capability    -   16: motor controllers    -   17: high-voltage electric field generator unit    -   18: filter    -   19: power and network cabling    -   20: sampling disk and with embedded electrode (may be the        cathode). This component bears the deposition surface (FIGS. 1.8        and 3.8) and is the medium of deposition    -   24: environmental sensors    -   26: screw stepper.

FIG. 2 is an illustration of a front oblique view (some features havebeen omitted for clarity) depicting an embodiment of the disclosure,with the following components identified:

-   -   2: induction unit    -   3: airborne particulate inlet aperture    -   5: static charge air chamber and electrode    -   10: spacer tube    -   12: pixel light ring with light baffles    -   13: objective lens    -   20: sampling disk and with embedded electrode (may be the        cathode). This component bears the deposition surface (FIGS. 1.8        and 3.8)    -   21 cleaning mechanism electrode.

FIG. 3 is an illustration of a back oblique view (some features havebeen omitted for clarity) depicting an embodiment of the disclosure,with the following, components identified:

-   -   2: induction unit    -   3: airborne particulate inlet aperture    -   5: air chamber    -   6: electrode (may be the anode)    -   8: deposition surface    -   10: spacer tube    -   12: light pixel ring with reflective light baffles    -   13: objective lens    -   18: filter    -   20: sampling disk and with embedded electrodes    -   22: deposition surface cleaning area    -   23: cleaning brush    -   25: imaging area.

FIG. 4 is an illustration of a rear oblique view (some features havebeen omitted for clarity) depicting an embodiment of the disclosure,with the following components identified:

-   -   2: induction unit    -   3: airborne particulate inlet aperture    -   9: translation or rotation mechanism    -   10: spacer tube    -   12: light pixel ring with reflective baffles    -   13: objective lens    -   14: focus mechanism comprising a linear rail, a motor and        end-stops    -   18: filter    -   20: sampling disk and with embedded electrode (may be the        cathode). This component bears the deposition surface (FIGS. 1.8        and 3.8)    -   25: imaging area    -   26: screw stepper.

FIG. 5 is an illustration of a front view depicting an embodiment of thedisclosure, detailing the flow of particulates through the system withthe following components identified:

-   -   1: an airborne particulate (enlarged and not to scale) enters        the airborne particulate inlet aperture    -   2: electrostatic charge imparted to particulate(s)    -   3: particulate(s) deposited on deposition surface    -   4: illumination and imaging of particulate(s)    -   5: brush, airstream, electrostatic charge, gravity, and filter        clean deposition surface.

FIG. 6 A flowchart representing the steps of the analysis method forcollecting, observing, and identifying airborne particulate matterdispersed in a gaseous medium with the following components identified:

-   -   1: collect airborne particulate matter onto the surface of        deposition medium    -   2: use an imaging device directed towards the medium of        deposition to assess the locations and sizes of acquired        particulates within the field of view, may be accomplished        through image segmentation    -   3: determine the optimal focus location for each particulate        using a focus assessment function limited to each particulate's        segment boundary    -   4: capture one or more images from many different lighting        configurations for each particle at the ideal focal location    -   5: store captured images in a local or remote data repository        for identity determination or other analysis.

BEST MODE FOR CARRYING OUT THE INVENTION

The subject matter of this disclosure represents an automated,computerized, electro-mechanical apparatus (FIG. 1, FIG. 2, FIG. 3, FIG.4, and FIG. 5) utilizing a combination of hardware and software toacquire, image, identify, quantify, and communicate resulting datadescribing airborne particulate matter (FIG. 1.7, FIG. 6) dispersed in agaseous medium (FIG. 1.1). Other than installation, the continued supplyof the requisite electrical power (FIG. 1.19), the continuity of acommunication network (FIG. 1.19 and FIG. 1.15), and periodicmaintenance to the apparatus, the operations of the disclosure describedherein can have, but do not require, the presence or actions of a humanoperator. The typical composition of airborne particulate matter inambient air is comprised of a complex mixture of dust, pollen grains,fungal spores, bacterial cells, viruses, by-products of internal enginecombustion that comprise components of air pollution includinghydrocarbons, and other compounds. The resulting data, which are the netproduct of the apparatus and its associated software, are images,identities, and quantifications of aerosol particulates. Such data maybe used for a variety of purposes which include improving the diagnosisand avoidance of airborne particulate matter-related human healthissues, plant reproduction, and other air pollution applications.

The disclosure is comprised of the following components: a collectionsystem (FIG. 1.2, FIG. 1.3, FIG. 1.5, FIG. 1.6, FIG. 1.8, and FIG.1.20); a lighting and imaging system (FIG. 1.10, FIG. 1.11, FIG. 1.12,FIG. 1.13, and FIG. 1.14); a release and cleaning system (FIG. 1.2, FIG.1.18, FIG. 2.21, FIG. 3.18, FIG. 3.22, and FIG. 3.23); and an analysismethod (FIG. 6). Each component is described in greater detail below.

The collection system enables the acquisition of airborne particulatematter from the ambient air. An embodiment of this disclosure mayutilize an induction unit comprising, but not limited to, a blower fan(FIGS. 1.2, 2.2, 3.2 and 4.2) or other air-flow mechanism to drawambient air (FIG. 1.1) from the atmosphere into the device through anaperture (FIGS. 1.3, 2.3, 3.3 and 4.3) that may project through anenclosure (FIG. 1.4). The size of the aperture is not important exceptthat it must be known for determining the volume of air flow forcalibration and airborne particulate matter quantification purposes.After passing through the aperture (FIGS. 1.3, 2.3, 3.3 and 4.3) andentering the device, the inducted air stream may enter into a largerventuri air chamber (FIGS. 1.5, 2.5, 3.5), and may pass a smallelectrode (FIGS. 1.6 and 3.6). The electrode may be negatively charged(an anode) and may act to increase the negative charge of passingairborne particulates (FIG. 1.7). A high-voltage electric fieldgenerator unit (FIG. 1.17) may create an electrostatic force and mayalso act to generate an oppositely charged field on a second electrode(a cathode) which may be situated under the deposition surface (FIG. 1.8and FIG. 3.8). The electrostatic force created between the negativelycharged airborne particulate matter and the positive electric fieldinduced on the deposition surface may draw airborne particulates ontothe deposition surface (FIG. 1.8 and FIG. 3.8), also referred to as themedium of deposition (FIG. 1.20). Periodically, a motor (FIGS. 1.9 and4.9) or other translation or rotation mechanism (FIGS. 1.20, 2.20, 3.20and 4.20) may engage to move the deposition surface such that additionalairborne particulate matter may deposit on a different portion of thedeposition surface (FIG. 1.8, FIG. 3.8, and FIG. 1.20). An embodiment ofthe disclosure may utilize a rotating disk with an embedded electrode(FIGS. 2.20, 3.20 and 4.20) that is oppositely charged relative to theairborne particulate matter and which may attract the airborneparticulates to the edge of a disk (FIGS. 1.8, 3.8 and 5.3). Thedeposition surface is continuous, allowing the observation of airborneparticulate matter to occur simultaneous with collection or after adelay following collection.

In an embodiment of the disclosure, the collection system maytemporarily shut off and discontinue acquisition of airborne particulatematter from the ambient air in the event of inclement weatherconditions. Inclement weather may comprise stormy conditions withabnormally high levels of wind that may allow moisture or excessivelevels of dust to enter the aperture (FIG. 1.3). Information regardingthe local weather or other environmental information used to determinecontrol of the collection system may be retrieved over a communicationnetwork via a cable (FIG. 1.19), a Wi-Fi connection integrated with theonboard computer (FIG. 1.15), or from environmental sensors (FIG. 1.24)comprising air pressure, humidity, and temperature, integrated with themain controller board and on-board computer (FIG. 1.15).

The lighting and imaging system enables the capture, recording, andstorage of images of sufficient quality for analyses and identificationof the acquired airborne particulate matter. In an embodiment of thedisclosure, a motor (FIGS. 1.9 and 4.9) may rotate the depositionsurface (FIG. 1.8, FIG. 3.8, and FIG. 1.20) and thus convey the acquiredairborne particulate matter from the collection area to the imaging area(FIG. 3.25 and FIG. 4.25). The imaging area (FIG. 3.25 and FIG. 4.25)may be encased in glass to avoid air flow at the imaging location. Anembodiment of this disclosure may utilize a finite objective lens (FIG.1.13), a spacing tube (FIG. 1.10), and a high-resolution magnifiedcamera (FIG. 1.11) or other optical or electronic sensor technology andan associated light/radiation system (FIG. 1.12, FIG. 2.12, and FIG.3.12) to capture and record digital representations of the acquiredairborne particulate matter. The objective lens (FIG. 1.13), spacingtube (FIG. 1.10), a high-resolution magnified camera (FIG. 1.11) orother electronic/optical sensor technology, and associatedlight/radiation system (FIG. 1.12, FIG. 2.12, and FIG. 3.12) comprisethe perception unit for human or machine observation of the airborneparticulate matter. Magnification of the perception unit may beaccomplished via optical means, digital means or both and may comprisean objective lens or series of lenses (FIG. 1.13), a spacing tube (FIG.1.10), a high-resolution magnified camera (FIG. 1.11), or other opticalor electronic sensor technology. The field of view of the objective lens(FIG. 1.13, FIG. 2.13, FIGS. 3.13 and FIG. 4.13) may be recorded with adigital camera (FIG. 1.11 and FIG. 4.11) or other electronic/opticalsensor technology that may be oriented so as to examine the depositionsurface (FIG. 1.8, FIG. 3.8, and FIG. 1.20) and the acquired airborneparticulate matter thereon.

For lighting, an embodiment of this disclosure may use multiple lightand electromagnetic radiation sources, individually controlled, andsituated in a ring (FIG. 1.12) surrounding the acquired airborneparticulate matter on the deposition surface (FIG. 1.8, FIG. 3.8, andFIG. 1.20). The lighting apparatus may utilize red-green-blue (ROB)light emitting diodes (LED) or other electromagnetic radiation sourcessimilarly situated within the pixel light ring (FIG. 1.12) to illuminatethe deposition surface (FIG. 1.8, FIGS. 3.8, and FIG. 1.20) within thefield of view of the objective lens (FIG. 2.13, FIG. 3.13, and FIG.4.13) with ultraviolet, visible, and/or near infrared electromagneticlight at a high angle of incidence onto the top adaxial surface of theairborne particulate matter. An embodiment of the disclosure may alsoinclude reflective light baffles on the pixel light ring (FIG. 3.12 andFIG. 4.12) to increase the amount of diffuse light in addition to directlight incident to the acquired airborne particulate matter on thedeposition surface (FIG. 1.8, FIG. 3.8, and FIG. 1.20). A control unitcomprised of a software system, which may be integrated with the maincontroller board (FIG. 1.15), may individually modulate and rotate theLED pixels through a variety of wavelength combinations from 200 to 800nanometers and lighting perspectives while the software may cause imagesof the acquired airborne particulate matter to be captured under eachlighting combination in order to obtain a series of obliquely lit,dark-field images captured from different adaxial and diffuseillumination directions, over a range of the electromagneticfrequencies, and across a range of illumination intensities. Obliquelylit and dark-field refer to the adaxial orientation of pixel light ring(FIG. 1.12) and the high-resolution magnified digital camera (FIG. 1.11)relative to the acquired airborne particulate matter on the depositionsurface (FIG. 1.8, FIG. 3.8, and FIG. 1.20) which is illuminated withlight and other electromagnetic radiation both on its top surface and/ordiffusely. To reduce camera noise, multiple camera frames may becaptured of each perspective and lighting combination, and the framesmay be averaged together into a composite image. Knowledge of thedirection, frequency, and intensity of the light source may be used tohighlight and infer topological features of the acquired airborneparticulate matter including pores and furrows of pollen grains andseptae or mycelia fragments of spores.

In an embodiment of this disclosure, the imaging system may have alinear focus apparatus (FIG. 1.14) which may allow the software to seekout ideal focus on a particulate-specific basis. The high-resolutionmagnified digital camera (FIG. 1.11), the spacer tube (FIG. 1.10), theobjective lens (FIG. 1.13), or the pixel light ring (FIG. 1.12) may rideon a linear carriage (FIGS. 1.14 and 4.14) to facilitate focusing, whichcarriage may be translated via a screw stepper (FIG. 1.26 and FIG. 4.26)controlled by a motor controller (FIG. 1.16). Focus may be accomplishedin two phases: coarse and fine. Using the digital camera (FIG. 1.11),the computer control system may assess the best focus for the overallfield of view (the coarse focus) by incrementally advancing the focusmotor (FIG. 4.14) and processing the image through a focus assessmentfunction. Such focus function may consist of bilinear squared differencefactored with the overall histogram width. Once the optimal focuslocation is determined for the overall field of view, image segmentationalgorithms (described below) may be used to determine individualparticulate locations and sizes. A fine focus process may then beperformed whereby the focal point may be translated through a rangeproximal to the overall optimal. Through this process, the software maytake multiple image samples constrained to the boundaries of eachsegment and at ranged focal positions. The optimal focus position foreach segment region may then be determined by taking the best of thefocus values for that region. This focus position may then be used asthe focus position in the subsequent imaging of each region.

The release and cleaning system enables the evacuation and discharge ofthe acquired airborne particulate matter front the deposition surface(FIG. 1.8, FIG. 3.8, and FIG. 1.20). Once a portion of the depositionsurface (FIG. 1.8, FIG. 3.8, and FIG. 1.20) has been imaged, it may becleaned before being rotated or translated back into the collection areanear the airborne particulate inlet aperture (FIG. 1.3, FIG. 2.3, FIG.3.3, and FIG. 4.3). Release and cleaning, of airborne particulate mattermay be accomplished via one or more of the following mechanisms or acombination thereof: reversing the electric charge; airflow; mechanical;physical; gravity; or filter. In an embodiment of the disclosure, thedeposition surface (FIG. 1.8, FIG. 3.8, and FIG. 1.20) may be rotated orotherwise translated into a region (FIG. 3.22) where oppositely chargedelectrodes (FIG. 2.21), a foam or brush cleaning mechanism (FIG. 3.23),passing air being evacuated from the device which may be from the actionof the induction unit (FIGS. 1.2, 2.2, 3,2 and 4.2), and gravity maycombine to remove the acquired airborne particulate matter and carry itor let it fall passively into a filter (FIGS. 1.18, 3.18, 4.18 and 5.5).

In an embodiment of the disclosure, an electric field may be utilized torepel the acquired airborne particulate matter from the depositionsurface (FIG. 1.8, FIG. 3.8, and FIG. 1.20). The creation of an electricfield of opposite polarity to that used for collection, between anelectrode beneath the deposition surface (FIG. 1.8, FIG. 3.8, and FIG.1.20) and another electrode (FIG. 2.21), which may be a plate or ringbeneath an air filter (FIGS. 1.18 and 3.18), may result in a strongrepulsive force being exerted on to the acquired airborne particulatematter located on the deposition surface (FIG. 1.8, FIG. 3.8, and FIG.1.20). Air flow may additionally be concentrated on the cleaning area(FIG. 3.22) generating an additional force due to a relative differenceof atmospheric pressure on the acquired airborne particulate matterlocated on the deposition surface (FIG. 1.8, FIG. 3.8, and FIG. 1.20)and creating an additional cleaning effect. Furthermore, a charged oruncharged piece of foam, brush, sponge, stopper, or other physicalobject (FIG. 3.23) may be used to generate a physical force on theacquired airborne particulate matter located on the deposition surface(FIG. 1.8, FIG. 3.8, and FIG. 1.20) and mechanically remove persistentacquired airborne particulate matter located on the deposition surface(FIG. 1.8, FIG. 3.8, and FIG. 1.20). In an embodiment of the disclosure,the deposition surface cleaning area (FIG. 3.22) may be oriented in sucha way that a gravitational force acts on the acquired airborneparticulate matter located on the deposition surface (FIG. 1.8, FIG.3.8, and FIG. 1.20), encouraging the acquired airborne particulatematter to drop away from the deposition surface (FIG. 1.8, FIG. 3.8, andFIG. 1.20) within deposition surface cleaning area (FIG. 3.22) and maybe in combination with the exertion of an electrostatic force, a forcecreated from the relative difference of atmospheric pressure, andphysical force. In an embodiment of this disclosure, the electrostatic,difference in atmospheric pressure, physical, and gravitational forcesrepresent separate removal mechanisms and may all be presentindividually or in combination within a concentrated area (FIG. 3.22) togive maximal cleaning and avoid contaminating of the deposition surface(FIG. 1.8, FIG. 3.8, and FIG. 1.20) during sampling collection cycles.

The analysis method of this disclosure (FIG. 6) enables thedetermination of the identity of acquired airborne particulate matter.The images acquired by an embodiment of this disclosure may be processedpartially or completely by the computer processor within the disclosureor may be transmitted to off-site servers for partial or completeprocessing. Image processing may comprise three dimensional (3D)reconstruction from lighting, image compositing, correction, or otherprocessing to enhance image quality including, but not limited to,histogram equalization, sharpness enhancement, and edge detection.Images may be analyzed manually by a human, via automated countingalgorithms, or both. After analysis, the images may be kept in a storagerepository for later analysis, or may be discarded. In an embodiment ofthis disclosure, the device may send raw imagery to a cloud servicewirelessly or over a network cable (FIG. 1.19), but may also run aneural network-based algorithm (described below) trained to recognizevarious identities of acquired airborne particulate matter includingspecies, genera, or family of pollen grains; species, genera, or familyof fungal spores; species, genera, or family of bacterial cells; speciesof internal engine combustion by-products; or the identity of otherairborne particulate matter.

An embodiment of this disclosure may identify acquired airborneparticulate matter in the captured digital images by using imagesegmentation algorithms, known informally as “Mobbing” techniques.Maximally Stable Extremal Regions (MSER) {13} and other algorithmsproduce a series of regions pertaining to each identified feature. Eachidentified acquired airborne particulate matter feature may be known asa segment. For segments larger than a configured threshold, thesegment's image may be passed into a proximal classifier function whichmay determine whether the segment is most likely to be a) a singlesimple object; b) a single compound object; or c) a cluster of objects.If the segment appears to be a cluster, a declustering functionutilizing concavity and seam based splitting may iteratively breakoverlapping segments into a series of masked out sub-segments. Theclassifier function thus described may be necessary to identify certainairborne particulate matter such as pollen which may have compoundfeatures, resulting in concavities.

For each segment (acquired airborne particulate matter featuresidentified by the MSER or similar algorithm), or group of segments ifthere are multiple acquired airborne particulate matter features locatedat the same optimal focus location, an embodiment's software may step tosaid focus position and engage the lighting and imaging system describedabove. The lighting and capture system involves sequentially turning onLED lights (FIGS. 1.12, 2.12, 3.12 and 4.12) and capturing imageslighted under various illumination intensities and from variousillumination perspectives. RGB LED lights may be strategically placed ona reflective surface FIGS. 1.12, 2.12, 3.12 and 4.12) around theperimeter of the objective lens (FIG. 1.13 and FIG. 2.13) and may beindividually controlled to illuminate the acquired airborne particulatematter from a multitude of perspectives, light intensity levels, andwavelengths. Acquired airborne particulate matter may be sequentiallyimaged with oblique lighting from multiple vantage points, highlightingthe features, topology, transparency, and absorption at lightwavelengths from 200 to 800 nanometers.

In an embodiment of the disclosure, multiple obliquely lit imagesegments may be used to infer three dimensional (3D) shapecharacteristics and surface features of the acquired airborneparticulate matter. Light transmissibility and reflectivity may also beinferred using this multiple lighting angle approach. To infer 3Dfeatures, a software model may be constructed starting with a malleableprimitive object, a sphere may be used as a reasonable malleableprimitive object. The model may be scaled to match the maximal extent ofthe aggregate captured image and may then be sculpted inward based onthe perimeter shape. Highlights from each directionally lit image may bethen used to push or pull portions of the model according to the 3Dvector of the particular light. If the object's facing surface isdetermined to be convex, highlights that appear on the side opposite thelight may be treated as being on the far end of the translucent object,thus shaping may be possible on both the facing and opposing sides. Oncea 3D representation of the object is constructed, its position may benormalized, a color or texture is applied to it based on the capturedimage(s) of the acquired airborne particulate matter, and may berendered with high-contrast lighting. The resulting rendering may becomposed with the original image, or may be used for direct observation.Alternatively, the 3D representation may serve as input to a classifierthat is suitable for working with 3D models.

An embodiment of this disclosure may implement machine vision torecognize and classify acquired airborne particulate matter via a neuralnetwork classifier. Prior to classification, various imagepre-processing commonly used in machine vision may be applied,comprising histogram equalization, sharpness enhancement, and edgedetection, Neural networks may be generally defined by, a set ofinterconnected input “neurons”. The connections may have mimetic weightsthat can be tuned based on experience, making the neural networkadaptive to inputs and thus capable of learning. The characterizationalgorithms may activate and weight neurons by the pixel values of anindividual input image. After initial weighting, the values may bepassed to other neurons where they may be transformed by other functionsrelative to a library criteria and then may be passed on other neurons.This process may be iterative and may repeat until the, output neuron isactivated and classification probabilities are achieved. The resultingprobabilities may be further weighed and identification may be achieveda statistical model of spatial and temporal abundance of the airborneparticulate matter, so that a particular acquired airborne particulatematter such as a pollen grain that may be deemed by the classifier to beequally likely to be either of two genera, will be weighted towards thegenera, that most likely for that location and time of year.

Segment images and associated analysis data may be, in an embodiment ofthis disclosure, available online to those authorized to access them. Inaddition to displaying the images, a human operator may be able to givefeedback regarding classification, which feedback and corrections may beused to improve the training of the classifier. The series ofsegmentation images, comprising the digital imagery or particle topologyinputs as well as initial particle determinations, may be used directlyor with further processing as inputs to classification software or maybe analyzed by a human, either remotely or locally, to produce airborneparticulate matter identity determinations. The statistical, spatial andtemporal model may also be improved, using data coming from devices, aswell as correctional feedback from software users.

In an embodiment of the disclosure, captured images may be processed bythe onboard computer (FIG. 1.15), and the resulting images and data maybe stored until Internet communication is established with a remotenetwork storage system via a cable (FIG. 1.19) or Wi-Fi connectionintegrated with the onboard computer (FIG. 1.15). The computer processorwithin the disclosure (FIG. 1.15) or off-site cloud servers may make thecaptured images and count results available online and via pushnotification. Quantification of the acquired airborne particulate matterbased on the time each portion of the deposition surface (FIG. 1.8, FIG.3.8, and FIG. 1.20) was actively sampled and collected may beaccomplished and included with the results.

The disclosure has been described in an illustrative manner, and it isto be understood that the terminology which has been used is intended tobe in the nature of words of description rather than of limitation.Obviously, many modifications and variations of the present disclosureare possible in light of the above teachings. For example, the devicecould include mechanisms to direct air currents strategically or toprotect itself from adverse environmental and weather conditions.Embodiments may use various deposition media on which to collectparticulates, various methods for positioning the particulates forimaging, and various methods of lighting and imaging specimens.Embodiments may also implement practical variants by allowing usersflexibility in the kinds of enclosures and mounting mechanisms.

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What is claimed is:
 1. An apparatus to collect and observe airborneparticulate matter dispersed in a gaseous medium comprised of: adeposition surface onto which the airborne particulate matter iscollected and held, wherein the deposition surface is a continuoussurface and comprises an embedded electrode that charges the depositionsurface with a charge opposite to a charge of the airborne particulatematter; a perception unit for human or machine observation of theairborne particulate matter on the deposition surface; wherein airborneparticulate matter is continuously collected on the deposition surfacesimultaneously with observing the airborne particulate matter on thedeposition surface.
 2. The apparatus according to claim 1, wherein arelease and cleaning system is employed to remove the airborneparticulate matter from the deposition surface after observation; whichis comprised of electrical, atmospheric, physical, and gravitationalforce components acting individually or in combination.
 3. The apparatusaccording to claim 1, wherein an induction unit is used to draw and/orevacuate ambient air into and out of the apparatus.
 4. The apparatusaccording to claim 1, wherein an air flow control unit is used toregulate the rate of air induction into the apparatus relative to anambient environment external to the apparatus.
 5. The apparatusaccording to claim 1, wherein a perception unit includes magnificationcomponents either optical or digital or both for enhanced observation ofthe airborne particulate matter.
 6. The apparatus according to claim 1,wherein a lighting and imaging system is employed to capture, record,store, and/or communicate digital representations of the airborneparticulate matter.
 7. The apparatus according to claim 1, wherein thecollected airborne particulate matter comprise but are not limited topollen grains, fungal spores, soot, dust, bacterial cells, and internalengine combustion by-products that are components in air pollution froma portion of ambient air drawn into the apparatus.
 8. The apparatusaccording to claim 1, whereby environmental sensors are integrated withthe apparatus.
 9. The apparatus according to claim 8, whereby saidenvironmental sensors or weather data retrieved over a communicationnetwork are used to determine control of the apparatus in the event ofinclement weather conditions, including the temporary shutting off ofthe apparatus.
 10. The apparatus according to claim 1, wherein theapparatus can have, but does not require, the presence or actions of ahuman operator except for installation, the continued supply of therequisite electrical power, the continuity of the communication network,and periodic maintenance to the apparatus.
 11. The apparatus accordingto claim 1, further comprising: an electric field generator unit forattracting and holding the airborne particulate matter to the depositionsurface.
 12. The apparatus according to claim 1, further comprising: anair chamber in which the deposition surface is disposed.
 13. Theapparatus according to claim 12, wherein the deposition surfacecomprises a rotating disk that rotates within the air chamber.
 14. Theapparatus according to claim 13, wherein the air chamber comprises: anairborne particulate inlet aperture in which airborne particulate matterenters the air chamber.
 15. The apparatus according to claim 14, whereinthe air chamber further comprises: a collection area, adjacent to theairborne particulate inlet aperture, where airborne particulate mattercollects on the deposition surface; an observation area positioneddownstream from the collection area relative to a direction in which thedeposition surface rotates and where airborne particulate mattercollected on the deposition surface is observed by the perception unit;and a cleaning area positioned downstream from the collection area andthe observation area relative to the direction in which the depositionsurface rotates and where airborne particulate matter is removed fromthe deposition surface.
 16. The apparatus according to claim 15, whereinthe deposition surface continuously rotates through the collection area,observation area, and cleaning area.
 17. The apparatus according toclaim 16, wherein the continuous deposition surface continuously rotatesthrough the collection area, observation area, and cleaning area suchthat airborne particulate matter on a first portion of the depositionsurface is observed in the observation area simultaneously whileairborne particulate matter is continually collected on a second portionof the deposition surface in the collection area.